to the franklin street one;
couldn't find any other licences using similar addresses (mit, for example);
additionally, remove 'how to apply' section from the main COPYING file and add 'END OF TERMS AND CONDITIONS' to the frontend copy of it;
skipped src/libs/zbxcommon/zbxgetopt.c and src/libs/zbxcommon/gnuregex.c as their style currently conflicts with pre-commit hook (uses spaces for indenting)
